{"product_id":"carrier-ph12na018000abaa-pressure-switch-jrhhvr","title":"OEM Carrier Pressure Switch 7#Open 22#Close 50\" Leads — PH12NA018000AB","description":"\u003ch1\u003eOEM Carrier Pressure Switch HK02ZB038 — 7# Open \/ 22# Close \/ 50\" Leads for Model PH12NA018000ABAA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement pressure switch (part number \u003cstrong\u003eHK02ZB038\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier PH12NA018000ABAA\u003c\/strong\u003e system. The pressure switch monitors inducer motor operation by proving that adequate negative pressure (draft) is established before allowing the ignition sequence to proceed. When this switch fails or sticks open, the control board cannot confirm safe draft conditions — resulting in a lockout, a no-heat call, or a system that starts the inducer but never advances to ignition. The switch opens at \u003cstrong\u003e7 PSI\u003c\/strong\u003e and closes at \u003cstrong\u003e22 PSI\u003c\/strong\u003e, with \u003cstrong\u003e50-inch leads\u003c\/strong\u003e for easy routing to the control board.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Opens at 7 PSI | Closes at 22 PSI | 50\" wire leads | Single-port pressure switch | Factory OEM rated for Carrier systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM pressure switches are factory-calibrated to exact open\/close setpoints (±0.1\" W.C. tolerance). Aftermarket substitutes often drift out of spec, causing nuisance lockouts or — worse — unsafe ignition sequences. This listing ships the genuine Carrier OEM part.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Power down the system at the disconnect before beginning. Tools needed: flat-head screwdriver, needle-nose pliers, and a manometer (recommended for post-install verification). Photograph existing hose and wiring routing before disconnecting the old switch. Inspect the rubber hose port for cracks or blockage, as a clogged port is a common root cause of switch failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In stock and ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed as a direct OEM replacement for Carrier model \u003cstrong\u003ePH12NA018000ABAA\u003c\/strong\u003e. Cross-reference part number HK02ZB038 (also listed as PS80-02-F0074 on some platforms). Verify your unit's data plate and existing switch markings before ordering to confirm PSI setpoints match. Our team is available to verify fitment — contact us before you order if you have any questions.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641972969843,"sku":"CARRIE-PH12NA018000ABAA-PRESSURE_SWITCH-HK02ZB038","price":57.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641973002611,"sku":"CARRIE-PH12NA018000ABAA-PRESSURE_SWITCH-HK02ZB038-GEN","price":50.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-HK02ZB038_62175ef9-dc77-4caf-a738-08a0026c8be7.jpg?v=1775037107","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph12na018000abaa-pressure-switch-jrhhvr","provider":"National HVAC Parts","version":"1.0","type":"link"}